450 
PACIFIC SCIENCE, Vol. VI^I, October, 1953 
tion, then again narrowly tubular to ootype. 
Connection between ootype and true seminal 
receptacle clearly discernible (Fig. \d). Sem- 
inal receptacle 0.065 to 0.190 mm. long by 
0.078 to 0.218 mm. wide, as large as or larger 
than ovary; slightly anterior to, more median 
and more dorsal than ovary; vitellaria folli- 
cular from level of anterior testis (3 or 4 
follicles anterior to .anterior testis) to posterior 
end of body; lateral and ventral to ceca, very 
few intercecal follicles anterior to posterior 
testis, then becoming confluent. Eggs rela- 
tively few (7 to 15), usually collapsed, 37 to 
68 by 22 to 43 }i, usual range 51 to 56 by 
31 to 36 Excretory pore terminal between 
anal furls; excretory vesicle I-shaped, extend- 
ing to posterior edge of posterior testis, joined 
there by principal pair of collecting tubules. 
Tubules extend anteriorly just median to ceca, 
cross ceca ventrally at acetabular level, narrow 
and tend to coil slightly at pharyngeal level, 
then continue forward lateral to oral sucker. 
COMPARISONS: S. stemsoma, with the 11 tes- 
tes in a single, median row, with the uterus 
found at least as far posterior as mid-ovary 
and sometimes slightly posterior to the pos- 
terior border of the ovary, and with body 
spines, differs from all previously described 
species of Schistorchis. 
S. carnetis was originally described with 
cirrus sac and without ani, but Yamaguti 
(1942: 362) concluded that the cirrus sac was 
absent, and Odhner (1928: 5) described the 
ani. S. carneus differs from 5. stenosoma in its 
bulkier body proportions, the retracted oral 
sucker, the smaller pharynx, the apparent ab- 
sence of an esophagus, the long excretory 
vesicle which extends anterior to the ovary, 
and the arrangement of the testes in two 
lateral groups. 
5. callyodontis differs from S. stenosoma by its 
lack of ani, the longer excretory vesicle, the 
ovary which is at the same level as the anterior 
testis, the nearly equal size of the suckers, 
the testes arranged irregularly in two rows, 
and the heavy musculature of the anterior 
portion of the body. 
5. sigani differs from 5’. stenosoma by its lack 
of ani, the longer excretory vesicle, the very 
short esophagus, the wide area between the 
intestinal bifurcation and the acetabulum, the 
nearly equal size of the suckers, the small 
pharynx, the testes which are arranged irregu- 
larly in two rows, and the larger eggs. 
The name stenosoma is a combination of 
steno- (narrow) and soma (body), referring 
to the relative slenderness of the body. 
Schistorchis zancli n. sp. 
Fig. 2a, b 
HOST: Zanclus cornutus (L.), Moorish idol or 
kihikihi loulu; in 1 of 9 specimens examined. 
LOCATION: Intestine. 
DESCRIPTION (based on two specimens): 
Body elongate, 2.409 to 2.643 mm. long, 
0.606 to 0.686 mm. wide; widest at acetabular 
level, tapering abruptly anteriorly at esopha- 
geal level and posteriorly at level of second 
testis; width of narrower posterior portion 
nearly equal; anterior end blunt, posterior end 
rounded. A few small, scattered spines present | 
anterior to level of esophagus. Traces of eye- | 
spot pigment present. Oral sucker subqua- ' 
drate, terminal, 0.168 to 0.196 mm. long by i 
0.256 mm. wide. Acetabulum l/3 body length 
from anterior end; rounded, 0.197 to 0.204 
mm. long by 0.183 to 0.190 mm. wide; sucker 
ratio 1:0.715 to 1:0.742. Very short prepha- 
rynx observed in one specimen ; pharynx 0. 1 19 
to 0.133 mm. long by 0.128 to 0.146 mm. j 
wide, nearly rectangular; esophagus 0.043 to | 
0.085 mm. long; ceca wide anteriorly, nar- i 
rowing posterior to acetabulum, nearly paral- |j 
lei to body walls, each with ventral, sub- ! 
terminal anus. Genital pore slightly to left j! 
of median line at anterior border of acetab- | 
ulum. Testes 11, largely intercecal but oc- 
casionally ventral to median portion of ceca, || 
serial and contiguous, 0.080 to 0.168 mm. 
long by 0.141 to 0.199 mm. wide, ellipsoidal | 
to ovoid in shape. Seminal vesicle 0.256 to 
0.285 mm. long by 0.183 to 0.219 mm. wide, 
saccular, with slightly swollen tube extending 
